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A 102.34, carat, D colour and flawless white diamond held by a model is displayed at Sotheby's auction house in London, Thursday, Feb. 8, 2018. The diamond is the world largest known round brilliant diamond to have achieved "perfection in all critical criteria - Colour, Clarity, Cut and Carat", and is expected to reach considerably over 33.7 million dollars by private sale in London.

A white diamond billed as the largest and purest of its type to come to market is expected to sell for well over $33 million.

Sotheby's auction house says the 102.34-carat gem mined from Botswana "is the only known round brilliant-cut diamond over 100 carats perfect according to every critical criterion" — carats, color, clarity and cut.

The diamond went on display Thursday at Sotheby's London showroom and is being offered for private sale. It's expected to fetch a price "considerably higher" than the $33.7 million auction record for a white diamond.

The auction record for any diamond is held by the "Pink Star," which sold for $71 million at Sotheby's Hong Kong in 2017.